Pressure induced superconductivity in a CeRhSi3single crystal-the high pressure study

Diversity in Crystal Structure and Physical Properties of RETX3 (RE - Rare Earth, T - Transition Metal, X - Main Group Element) Intermetallics

Rare Earth (re) based intermetallics are a fascinating class of inorganic compounds due to the presence of highly localized f-electrons. Among the ternary intermetallics, RETX₃ (RE - Rare Earth, T - Transition metals, X - 13-15th elements of the main groups) is one of the most widely studied RE-based intermetallic families in terms of diverse crystal structures as well as physical properties. This perspective presents a brief account of different structural variations observed in this family of compounds. We have also discussed structure-property correlations in selected compounds in this series that show interesting physical properties such as spin-glass behavior, superconductivity, heavy fermion behavior, Kondo behavior, etc. The origin of different physical properties of these compounds is also discussed in brief by correlating their crystal structures.

Exciton and fermion-pair condensation at non-zero temperature

A thermodynamic study of a many-particle two-level system with theSU(2) ⊗SU(2)-symmetry interaction in the particle-particle and particle-hole channels is carried out. Using the symmetry of the system, its free energy and phase diagram are calculated. It is demonstrated that the superconducting (particle-particle) and excitonic (particle-hole) condensates are both formed in the considered system which undergoes two phase transitions. The calculated phase diagram represents qualitatively the phase diagram typical for materials with the high-temperature superconducting properties, including the existence of two phase transitions, the first and second order phase transitions, triple and tricritical points.